value raise or slow play?

[willie24]

25/50 online 8 handed.

MP1 is LAG preflop, loose-passive postflop and way too tight-passive on the river. appears to be a beginner.

Do not have great read on SB except that he is somewhat tight-typical.

Hero is UTG with A [img]/images/graemlins/spade.gif[/img]A [img]/images/graemlins/diamond.gif[/img]
hero raises. folded to MP1 who calls. folded to SB who calls.

flop 2 [img]/images/graemlins/spade.gif[/img]2 [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/spade.gif[/img] ($175)

SB checks. Hero bets. MP1 calls. SB calls.

turn: A [img]/images/graemlins/club.gif[/img] ($250)

SB bets.

Call or raise?